I don't think you can ever be too prepared.

"The best films are the ones that make you think, that challenge you, that stay with you long after you've left the cinema."

把肉扔在饿虎出没的小路上，祸患就无可挽救了。主动招惹麻烦，怎么可能平安无事。

The beauty of topological insulators lies in their robustness; their surface states are protected by symmetry and topology, making them immune to certain types of disorder.